here are some numbers for you, therefor facts. The only games on ps3 to ever outsell SSBB (I'm counting sales on ps3 alone) are CoD:MW3 and CoD:BO *spits on ground*. This means that between ALL of your ps3 exclusive that I'm sure you loooove sooooo much, NONE of them outsold SSBB, not GoW, not Uncharted, not Killzone, not GT, NOTHING outsold it other than the last 2 CoDs.
Now, for ps3 games that outsold SSBM, you add to that list CoD:MW2 *spits on ground*, GTA4 and GT5.So now, the only games that outsold SSBM are 3 CoDs, a GTA (making this 4 3rd party game) and GT5 the only 1st party game to outsell SSBM. Meaning if you hope to outsell SSBM you need to be a game from 3 of the biggest crazy successful franchises. With GT5 being the only 1st party game and it barely outsold it (outsold it by 400k), knowing that every other Ps3 first party game failed to outsell SSBM, what make you think that a poorly named and unproved new IP will?
Finally, for the original SSB, you add to the list CoD:4, FIFA12, MGS4, and Uncharted 2. Again an other CoD and a other hugely popular franchise (FIFA is ridiculously huge in europe but for some reasons this year's title is selling awfully more than usual and I have no idea why... lol) and MGS4, making it the 2nd PS3 exclusive BUT it had the ENTIRE PS3 lifespan to sell units and despite that it ONLY outsold SSB by 60k units. So if you honestly think that PASBR will be as successful as MGS4 which IMO was the biggest system seller on the system for a while, it would still need 4 years to reach SSB and I doubt the PS3 even have 4 years left. Same result for UC2, if it gets as popular as UC2 (which I srsly doubt), consider the fact that UC2 has been on the market for 3 years, won countless of GoTY awards (something that PASBR wont) and according to today's numbers it only outsold SSB by 20k. So plz answer me this question... Do you srsly think that PASBR will be as popular and will win as many GoTY award as UC2? If your answer is ''yes'' than according to that logic it would still take 3 years (not sure if the ps3 have 3 more years to go) and I think it would also have to be bundled cause I think UC2 was bundled at some point I'm not sure. Than in 3 years, if the PS4 is still not out, after PASBR won all the GoTYs in the industry and after everyone hyped the game as being a unique experience (wont happen cause UC2 was unique at the time with its movie like action, while PASBR is just a clone) than ONLY if all these conditions applied, it would have outsold SSB by a small 20k. (I know its a rly flawed logic, but I still think its a valid way to look at things).
In conclusion, on the entire Ps3 lifespan, only 4 CoDs, 1 GTA, 1 GT, MGS4(after being on the market for 4years) and 1 UC game(by a miserable 20k after being on the market for 3years) outsold the original SSB. And I don't see why or how PASBR could be able to do what no GoW, Killzone, Final Fantasy, LittleBig Planet, Assasin's Creed, Madden, Guitar Hero, Resident Evil or even Uncharted(except for the 2nd) could.
Personaly, I think it will sell between 1.5mil and 2.5mil but I think closer to 1.5. MAYBE 3mil if its bundled. I think the name sounds like a shovelware title, and footages I've seen so far also looked like from a shovelware title (I think it lacked a certain charm and production value that SSB games have but granted they havent revealed much). Their is still a market for it cause obviously alot of Sony fans wanted a game like this for a while, but other than those guys I dont see alot of ppl who would be super interested in buying it. Maybe it will do well in europe cause it seems for some reasons that europeans are huge sony fanboys.
Also, Wii U will be launching around the same time, offcaurse SSB won't be a launch title but KI:U went gold like 6months ago, whitch means that by E3 the next SSB will already be in production for 6months, MAYBE we will see a small teaser trailer (I doubt it but still possible) or maybe some screens and info. If it happens that would take alot of hype from the PASBR.