Don't forget Yamato has many other product lines, not only Macross. Even if they did stop producing Macross toys, I don't think they would go out of business.
Anyway, I'm sure we will continue to see Macross products from Yamato, although even I don't really have a clear idea of what's in the pipeline apart from lots of Macross Zero stuff.
As for the 1/48 VF-1 toys, well at the moment most asian retailers still have a fair amount of stock, so it's pointless putting the older 1/48 toys back into production at this time if no stores are going to buy them. It doesn't make good financial sense for Yamato to fill their warehouse full of 1/48s when there are no customers. I'm sure once the stock starts to thin-out Yamato will start getting requests from their distributors for more 1/48 toys and once they recieve enough orders they will pump out another production run.
Anyway, it's not like 1/48 toys are especially difficult to find right now (except for the Low-Vis). I mean it's only a few months ago that the VF-1S Hikaru and VF-1J Hikaru came out, plus we had the reissues of the VF-1A Hikaru and VF-1S Focker quite recently as well. Not to mention the VF-1J Super Max is coming at the end of this month and the VF-1J Super Miria in April.
It's not a good idea for Yamato to over-saturate the market with 1/48 VF-1 toys. Frankly speaking after the Max and Miria come out, it would probably be a good idea for them to wait at least 1 or 2 years before producing anymore 1/48 VF-1 toys in order to increase the scarcity of the toys and give sufficient time for demand to build.
Graham