It should be quite clear to everyone actively playing SOD, that Sk's and Warrior's currently are at a huge exp disadvantage in game. . . . a quick look at top 5 list of players quickly shows that Shadowknights and warriors (+ enchanters really but thats a separate issue) are far below other classes in tomes. I am fairly certain that a look across the entire database would show even more alarming differences. Now this can ofcourse also be a direct result of fewer people playing Shadowknights and Warriors, although if so, the exp disadvantage might very well be the reason for that too.
The problem I have here is your whole basis for arguement: you are saying that "Warriors and SK's lack tomes because it's harder for them to get EXP" and then go on to claim that "Warriors and SK's lack EXP because nobody wants them as tanks".
Both of these statements are assumptions based on correlation, and I can show you pretty easily how they are not causual.
point 1: Warriors and SK's lack tomes: this is true. The question is why?
I absolutely disagree that nobody wants warriors and sk's as tanks. I would take one of either in a heartbeat if I needed a good tank in a group. But there are some issues:
I see a major lack of mained warriors overall - maybe this has something to do with how fun it is to play the classes? Or how anybody who rolls a warrior to start finds that nobody in the raid game wants him because they already have a bot that retired 3 years ago and nobody has to worry about ownership responsibility and dramamongering on that character after donating for a 500k charm? Or maybe that it's not a great duo class so on a server with a slightly lower low-end population it's harder to exp one?
I don't see too many fewer shadowknights, but it's been a while since I actually thought about it. Warriors are definitely poorer off in this respect.
So yes, playabilty of the class may be an issue.
But, the larger issue I see here is tome usefulness. You also noted that Enchanters are low on tomes. Is that because there aren't any high end enchanters? Or maybe the bottom line is just that Enchanters, like SK's and Warriors, don't see a big benefit from tomes, so they don't feel a need to grind them out!
Paladins get a huge benefit from tomes, both affecting their dps (as a dps-type tank) and their heals (as a heals-type class). Warriors, SKs, not so much. I'm convinced that if the tomes provided anywhere near the benefit for these classes, they would pursue them, and they wouldn't have a hard time 'finding groups' to do so.
Bottom line, correlation =/= causation, and I can see a much better reasoning for WHY sk's and warriors lack tomes than 'hay I can't get a group =('
If I were to put out a solution in advance of ikisith tomes I would advocate putting a set of 1% mitigation tomes out for sk's and warriors only. (though I'm not).