Ok - interestingly, Brian, you started another topic almost identical to this one not long ago.
I've just gone through and TAGGED some of the more relevant discussion threads - scroll down to the bottom of this page - I've called them "asl: alternate eras" for those interested in seeing the past discussions.
It's a good topic, so no harm discussing it again. There are currently yahoo groups set up developing a variety of "modern" ASL projects that you can find by joining yahoo and doing a search. Some members of the board contribute to them in various ways. Can't tell you what their relationship with MMP is or if they are still recruiting, etc.; best bet is to contact them directly once you find them - but there is certainly a lot of interest and I can say from experience that they are certainly active.
Wild Bill's unofficial variants seem popular as do Critical Hit's pre- and post- World War II modules.
Those who aren't interested, don't need to buy them, naturally. I would love to see MMP put out an "official" post-1945 rulebook, however, encompassing "modern ASL" - just one way of many to encompass the post-war era. Many conflicts to choose from - Israeli conflicts, Iran-Iraq, Vietnam, Falklands, fictional NATO vs. WP. The more recent they are, however, the harder to research due to material being classified and harder to obtain ballistics testing data (as far as armour penetration stuff - hey, they're still arguing about the Second World War stuff, really).
If it generates revenue for MMP and isn't a drain on their resources, why not? I'd much rather see a stamp of officialdom on it no matter what quality the TPP are capable of.