Overall, it doesn't matter if....
A) You can pay or can't pay
B) Are willing to pay or not willing to pay
C) Think it is fair to pay or not to pay
D) Any combination of the above
If Blizzard is going to host servers, there is going to have to be some revenue generating mechanism for them to pay for the IT infrastructure, the technical support, and most likely some developer support. They are not going to lose money over this. The revenue will come from one or more of the following:
1) One time purchase price
2) Required Monthly Subscriptions
3) Licensing Fees to allow 3rd Parties to Host Servers (e.g. - Nostalrius)
4) "Premium" Service Subscriptions (not required - but give perks to those who pay)
5) In-game Purchases/Services
For the Vanilla/Legacy purists, options 1, 2, and 3 are the most appealing. Pure classic servers at a known/fixed cost with everyone on an equal playing field.
For the cost-conscious, options 4 & 5 would be more appealing. Basically, it would be free-to-play but some players could pay to get perks. No longer pure classic, but it has a free-to-play mechanic. (see Heroes of the Storm for example)
Now this is assuming that any licensing fees that Blizzard would require of a 3rd Party would be reoccurring and substantial. I can't imagine they would be willing or able to license their IP at a modest or one-time cost. So I'm also assuming that in order to pay for those licenses, Nostralrius (or someone else) would need to generate their own revenue to subsidize those licenses. Hence we are back to #1, #2, #4, and #5.
Basically, regardless of the "fairness" of the situation, any Blizzard-supported solution is going to come at a price. The only alternatives are the private server market - which come with their own risks/issues.
Anyway, another $0.02 while we wait for the results of these meetings....
