It would be nice, but I doubt it will happen.
The problem is that there is not enough demand in the market.
Don't forget that (apart from Japan) the market for tamagotchis of any kind is very small and it would be a big investment for BanDai to start producing one of the older versions when they probably could not sell enough to make it worth their while.
Think about it - how many people do you know in the whole of your school (or college) who play and buy tamas?
(I'll bet it is not so many compared to the whole school population).
Tamas are played with and collected by enthusiasts now.
That also makes the older versions more collectable and rare
If you want older versions, then you have to pay a little bit more for them - unless you are lucky and can find them in local "Good Will" / "Charity" or "Second Hand" stores.
It's also worth taking a look at any yard / garage sales in your area - you find them there too