Do u guys think this game gonna last long

All depends on how well EA & Crytek support it.

If their anti-cheat works and they continue to update and release content for it, it should have a good life span.

I hope itw not plagued by lag

The game will undoubtedly have a small player base as Crysis has always been a niche franchise. As for how long these players choose to stick around this depends on the state of the game after launch and how much effort Crytek is going to put in.

Crysis 2 would have lasted longer had they bothered to fix the problems and actually attempt to combat cheaters which plagued the game so much at one point you literally couldn't get a game without an aim botter, infinite energy hacker, etc.

We've already seen hackers in the Beta so there will no doubt be cheaters when the game goes retail.