Gamecube sold 4.44M lifetime in Europe. PS Vita is currently at 4.08M in Europe.
Can PS Vita beat Gamecube and sell more than 4.44M in Europe?

Only if Sony keeps the system for another generation. If the Vita has a lifespam as the GameBoy, it could sell 4 or 5 million in Europe. If they don't, people will just buy a PS4.

Nope.

Maximum will be close.

Hmm, if it continues at the rate it is going, if it is still in the market, the Vita could pass the GC in 2 to 4 years maybe? So I will say yes, it has a good chance.

Depends on Sony. There are plenty of japanese games still coming out, but they need to keep supporting it and incentivizing those localisations.

Maybe, if they keep marketing it as an 'accessory' ( which provides unique functions ) for the PS3/4, Project Morpheus, Xperia series, Sony TV's.

I think it can equal that number overtime. Maybe. The gamecube was cheaper than Vita though, so if Vita ever goes 99 euros I think it can reach 5M.

Ultimately depends if Sony continues to support the Vita for a good while.

It all depends on how long the PS4 is in the market.

Yes. I don't see the Vita going being discontinued any time soon and we know VGC has been undetracking it for the longest time now.