Might as well throw in my 2 cents. Bara games probably are declining in Japan, but then again so are all eroge, even the straight ones. (In fact, lots of companies had to declare bankruptcy the past couple of years due to said decline.)
This is also one of the reasons why a lot of these companies are turning to international platforms like Steam, and gradually making their games available in English. There's more demand and a far larger audience to reach overseas.
With this in mind I think bringing over existing bara games in English would actually be a huge help for getting more of them made, so it'd be like 2 birds, 1 stone.