As much as I love Zelda, I also couldn't imagine my life without Mario Kart, Goldeneye, Mass Effect, Mario, Red Dead and GTA, Smash Bros, F1 games, Fable, Gears, ect.

It would be too much of a sacrafice to give up every other game out there for one series.

I don't have a singular favorite franchise and can hardly imagine picking just one to be considered.  The entire premise of this dillema is meaningless to me.  Regardless, I'd never want to be stuck just playing one series for the rest of my life and can't imagine anyone else actually would either.  Anyone who made that decision would come to regret it very soon, or they'd just stop gaming altogether in time.

Every other game for sure.

I guess my favorite series is Super Mario since Super Mario World and Super Mario Galaxy 2(still deciding how much I love the game) are among my all time favs. Right now Mario is on fire!...but the inevitable future of the series without Miyamoto makes me question how great the future is for the italian plumber.

I'd much rather have every other game than my one single fav franchise

I mean there are dozens of superb games that I also enjoy and are almost at a tie with my fav

Heck, I'm not even 100% sure what my fav franchise is, they're all so good :p

Mario is my favourite franchise, so that would be pretty easy for me...

It would suck not being able to play the one game/franchise you really want to, and playing a bunch of fillers that are nothing more than bad wannabe clones, or worse yet something you are not even interested in.

Variety might work for some people that don't get tied down to the major titles, but for the majority the top franchises are there because there is a lot of replayability.  Most of the fun is emergent and comes from you and your friends rather than whatever the game devs decide to do.  A lot of the best franchises are easy to access, hard to master which adds to replayability.

Especially for older gamers who don't have a lot of free time, it's more important to be choosy and not waste your time on things you don't want to do.  I wouldn't be surprised to see most of today's gamers playing 1 or 2 games overall, usually FPS, MMO, or split between the two.  The games nowadays just demand so much time to grind or to keep up your skills with your peers that there isn't a whole lot of room to do anything else.

For me my favorite franchise would be Zelda, Mario, Gears of War and Halo since I cant choose one from another

So Im good