Yes it is true. Emulation has reached full maturity. The next Nintendo console will feature a free online service that will include downloadable content consisting (among other stuff) of huge library of NES, SNES and N64 games. (Note: I said the online service will be free, not the downloads).
So, because of this, Nintendo is very intolerant of any distribution of their property. As well, thanks to great sales of retro game collections and retro TV game devices, many other games too are now considered just as valuable as they used to be.
I expect the trend to be that more and more companies will clamp down as they find they now have new avenues to sell their old games.