Hmm...I don't think so, at least, not to the point that I'd be particularly concerned or annoyed. The problem isn't the excessive number of lazy ports (or "remasters" as they prefer to call them) but the lack of new titles on current gen, and I don't think there is necessarily a correlation between the two. I doubt new games would come out any faster if there weren't any ports on the current gen, at least.
You've had some developers like EA refusing to port games under the excuse that they want to focus on developing new content, but...well, that's EA, and EA are both lazy and incompetent, so perhaps they're not the best example. There are plenty of developers who are porting their old titles to the current gen whilst they develop new games, and they're doing it at the same speed as those that aren't.
I guess I see these ports more as filler space whilst developers work on new titles, rather than something to be concerned about. They let people who missed them the first time around for whatever reason play them on the current gen...or they let those of us who have played them before play them again if we want to. They're also closing the gap between generations and padding out the library whilst we wait for some new games to come out. They make the new gen more attractive: after all, you've got the "best" of the old generation and the promise of more games for several years to come to entice you.
I think the problem is more that the current generation was released too early and developers aren't very good at managing their assets or their time. Last gen ports are just one symptom of this stifling lack of creativity and excessive greed in the Western market, and they're by far the least worrying. Especially considering the usually reasonable budget prices and addition of all the DLC they usually come with.