Currently corvettes have a terrible attrition to military usefulness ratio. Naturally this isn't a cold hard number based ratio, but a "feeling" based on experience ratio.
In my "humble" opinion, corvettes should bleed a reasonable amount of credits to "assist" in countering a titan, but not too much!. Also, a military player facing a stalemate will in the end not have a chance if the attrition rate/military effectiveness is too high. I would say that developers need to expand the debuff list when corvettes attack titans specifically, perhaps all corvettes will have a chance to drain antimatter and a chance to increase weapon cooldowns on titans only(all in all, more researchable corvette passive abilities would be great, 2-3 per faction, or one racial and one factional research). Every race could have a few new abilities. I for one think the advents only chance to deal with the ankylon titan is to stop all healing on it and drain its antimatter. Naturally LF are going to be terrible at this, so having two passive abilities, chance to interrupt healing on titan and antimatter neutralization would be nice to have. naturally this statement is made before testing the new advent titans and their abilities...i did read that the advent rebel titan would be "supremely hard to kill"...makes me smile.
I would say that capital ships need a place to shine(after being outdone by the titan), so make them really effective at taking out corvettes, specifically give the battleships (and the rest of the capitals to a lessar extent) a place to really shine as heavy anti corvette platforms. This would give them a great use in the early game as well, and have an entirely new counter setup. Capitals countering corvettes should be a relatively hard counter, hard enough that even a few seconds under fire would net in a corvette loss or two(or in the kols case, 4-5, a corvette killing machine!). This will encourage player skill in avoiding capitals and bring back the movement dance we all know and love.
Corvettes should be moderately hurt by flak imo, a gentle counter as opposed to a soft counter if you get my drift. Flak already has so many uses as it stands it doesn't need another reason to be built(to avoid single ship spam ftw...but with titans now a 100 flak fleet isn't so dangerous).
This would make fleet fights where the Titans target capital ships to take them out under heavy fire to weaken the enemy fleet so that the corvettes can go in with few losses.
Certain capital ship abilities, like TK push, Jam weapons and Flak burst etc. should affect corvettes as well, but at about 50% effectiveness(rough guess), imo.
Also all cruisers shouldn't be able to hit corvettes, along with long range missile frigates. Using scouts/lf to early counter a corvette spam would be a great way to prevent early huge clouds of them(which could deter titan production). That or increasing their cost, which then you would run into attrition problems. Titans shouldn't kill corvettes too fast as they are "designed" titan killers to be both too small to be hit by the big guns and too big to be hurt by anti fighter/bomber flak too much.
Also, a corvette trench run on the ankylon for a one hit exhaust hole kill with the words "stay on target!" screaming into your ear would be nice.