Hmm, possibly. It would be a shame as the current Troop ascension requires nothing else spent to increase the rarity.
But perhaps if the Traitstones do require some sort of purchasable spending, one gem for Minor ascension, five gems for Major, etc? For example:-
• 1 gem - convert Minor to Major
• 5 gems - convert Major to Runic
• 10 gems - convert Runic to Arcane
• 25 gems - convert Arcane to Celestial
I really couldn’t see the starting point being any larger than one gem just to create a Major Traitstone.