If I see a good deal for them, maybe. I already got them digital on PS3 via PS+, but haven't found the time to touch em yet.

Because people will buy both? :p

If people will buy both, why not go with the route that takes less effort?

Nah, next gen they'll just remaster the remasters.

The Last of Us Remastered Squared. 

I never played them, that might interest me: I'm (finally) getting my PC this June, and I get a free DL code for Arkham Knight.

Crazy thing is I own all of the Arkham games, including Blakegate, at least twice! I still want a remake just so I can pay them with better presentation. I played Asylum a few months ago and it looked pretty dated.

Because in the long run it's more profitable to make both. Remasters do often have a very high effort to profit ratio, but ultimately they're both a finite resource (especially since you're mostly limited to your 7th gen releases if you want to keep the effort level low) and leave the majority of your teams/studios sitting around doing nothing. 

It makes more sense to use remasters as a revenue supplement to the development of bigger games. You're going to have to make new games eventually anyway, so you might as well use your pre-existing studios to start on it now. That's the strategy the majority of publishers seem to have adopted.

You're giving companies way more credit for thinking ahead than they deserve.  Ultimately, we haven't, as of yet, seen the profits being used to really invest in new IPs.

woo hoo...... -waves flag-

Regardless to whatever linear investment path those profits take, most publishers do seem to see the merit in doing both at the same time. Off the top of my head I can't actually think of a single major publisher who doesn't have at least 1 major new title in development (and announced).