The combat is not "actiony". It's just button mashing which is actually the worst combat design somebody could think of. And then again such combat is made for SOLO RPGs, not for party RPGs.
Whether you like such combat or not, and what you want to call it, isn't relevant. It wasn't for you in the first place. Unless you're saying that absolutely zero players like such combat?
As for whether such combat only works in "SOLO RPGs," why is that the case? If I leave NPCs under AI control anyway, I can play the PC in other styles. Both DAO and DA2 played perfectly fine that way, although at the higher difficulty levels in DA2 you had to do a little bit of Tactics work first. That's generally how I play them, partly for the challenge, partly because I've come around to the idea that role-playing ought to be about playing my character, rather than some mysterious telepathic gestalt that comprises the entire party. (It's a pity DA doesn't include NWN-style voicechat commands. Hopefully they'll copy that over from ME3 next time around.
Note that I'm personally indifferent to auto-attack. Click, don't click, hold down a button, it's no big deal whatever way it plays.
If Bioware wants to make action games in the future they should skip their party as well. There is no reason to have badly AI controlled companions everywhere. If they want to make a real action game (based on skill and reflexes and such) they should make DA a solo game with your companions staying at your castle waiting for you to chat...
Why should they do that? Are you trying to preserve genre purity for its own sake? If not, what's the argument?
And then again you could have the same combat in a unified system as well if you really want to stick to it. There is just no reason to make to completely seperated game modes that feel completely disconnected from each other.
Now I'm not sure what you mean by a "unified system," since your unified system now is supposed to incorporate two different styles.