lategame balance . are my concerns true ?

[Cainehill]

Graeme Dice said:

Both of those spells only give 50% resistance. Wrathful skies with storm and false horrors can hold off a very large number of vampires. High-level fire magic will also quickly decimate their numbers. Flames from the sky can also kill huge numbers of vampires.

Decent earth magic can also decimate them - blade winds should cut a huge swath through the vampire ranks, and isn't reduced by any elemental resistance (mass protection would help, but makes them more vulnerable to fire; legions of steel is thus the only real counter I can think of).

Vampire hordes are only truly impressive against the AI in single player, or against an opponent who is out-matched anyway (in player skill, in research & gem income, or provinces & gold income).