Well I'm a cyclops fan.So,I've a storyline for him when he comes back.I want him to join the avengers,of course after redeemming himself at some point & there will be a major storyline where Steve Rogers will die & he will ask scott to take up the mantle reminisizing he should've handled the phoenix situation better & don't make scott go villain/anti-hero on them.Well,this will not be shown as a fact but more as a Roger's good will & Scott will take up the mantle.

Now there will be consequence for him becoming the new captain america.Tony,T'chall won't like it.Civilians outburst will happen.

There will be mutant groups they will think scott betrayed them by taking up the mantle & will try to kill him.Others like sinister will create events that will try to force him to rejoin the x-world.

And there will be militarily fraction those who believe the title belongs to the "armed forces".They will not like the mantle is being taken up by a civilian let alone mutant.So,they will wage their own war against him(like the hulk),might be try to be little him.

I think a mutant captain america will be really interesting.Will shake things up in both avengers & x-men world in a big way.