that IS a good point. since it is really easy to get to 50 with an alt, players who want to be optimal would just create an alt for every class they play instead of cramping everything into one character to circumvent the current restrictions on tomes.

On the other hand, the opportunity cost include convenience, ability to gear up for another class, not needing to level subclasses for cross class abilities etc. The said problem is only an issue for players who 1) have multiple classes at 50 and 2) have sufficient time to gear them up in that manner. i believe players who do fall into this profile surely would not mind creating alts for the their perfectionistic pursuit. but for most of the player vase who are more casual and are not as committed, I don't think this is that big of a problem, yet.