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Really hope GW bring Epic back, personally I can't stomach 28mm for anything other than skirmish level stuff consisting of a few squads.
Neither AoS nor 40K currently relies on accessories to play.
I'd probably end up just buying the models and using another or older ruleset with them. I found on a brief read through Titanicus that it felt too micro management which didn't appeal. However I still like the models and have enough to build a basic force. Similarly I have some of their aeronautica stuff, and I'm hoping the next natural step is Epic. Right now it seems like they're just dancing around the corners, teasing us with the possibility.