Well, this is the first of many games that will be coming off of abandonware sites I fear, depending on the success of the Good Ol' Games site (
http://www.gog.com/en/intro). All the positive noises for G.O.G. has prompted this sale of X-Com titles I believe. I also believe the more successful G.O.G. gets the more retro PC games you are going to see for sale rather than as abandonware. Either games will be licensed to G.O.G or the publishers will do deals with STEAM and others, or make the titles available themselves at a low cost.
We may, in fact, be seeing the end of abandonware as we know it because of this new trend, because if most or all the classic games are not available on abandonware sites, the number of hits will drop dramatically.