I'll echo "It's always a good time!" line, as I do love a nice revolver, even though my two carry pieces are autos.
If this travesty passes, I think there'll be two surges: one that we're seeing now, but only stronger, where semiautos with a decent capacity will be even more sought after... and after, when everyone's got "theirs" and everyone has to figure out what they want from the "postban" inventory.
Larger calibers will be again on the rise, as if you're limited to ten, might as well make 'em more effective. Revolvers will probably come back up a bit, as a .357 is pretty darned effective and those have gotten up into the 8 shot range too. I used to have a 7 shot Taurus and liked it a lot.
Then it'll all settle down, and we'll wait for this to be overturned or sunset (I think they'll do whatever they can to avoid a sunset clause this time), or for the next round when they target Grandpa's old bolt-action "High-powered sniper rifle" or the revolvers as "Saturday Night Specials"... they have a nifty demonizing term for any class of weapons, I'd bet, just waiting in the wings until we're fighting for our right to keep and use butter knives and Piers Shears (formerly known as plastic kindergarten scissors)