The reason IMVE was made is because of the failed home version of IM that, unlike other Stern home games, had a near identical version of the playfield as the commercial machine.
Stern had playfields remaining (probably whole machines left too) and decided a few tweaks could give them another run of IM Pro's easy.
Not the case with Tron
Definitely not the case with LOTR.
Maybe a VE happens, but with the pin titles coming out in 2015, I sincerely doubt another VE is coming soon.