Yes
Yes if they chose only one to play on.but someone who wants a classic server would split the population and would either have tho choose which one to play on
Difference is that with pristine it would be included in normal sub since it costs next to nothing to implement while with classic nost like server you would most likely have to pay extra sub since it would be expensive to make it(blizzard words)...... meaning that many people would have to chose 1 version of game to play meaning fragmentation of player base.
Add to that pure bc/wotlk servers and now we have 4 groups playing different versions of game leading to further splitting.
Thats not contradictory.You are contradicting your own arguments.