You can get the dvd's of TOS-R relatively cheap sometimes on the likes of Play.com/Amazon compared to what they were. I don't know how the next format will go but like Sam says, it might not automatically be moved onto it.
'If the Apocalypse starts, beep me!' - Buffy Summers
'The sky's the limit.....' Jean-Luc Picard, 'All Good Things'
courtesy of Saquist