To be fair, in the past, we haven't exactly had a ton of non Scottish players in the ranks. Hell, we haven't had as many Englishmen as one would think.
From memory, our teamsheets have mostly been Scottish and English, maybe a dotting of Irish/Northern Irish and Welsh players. And maybe a handful of players from out with the British Isles.
Comparing the squad to previous squads, such as Yogi's 2014-15 squad, there's a glaring difference of origins of the players. But it does show that Scottish players shouldn't be cast aside. Looking at the Prem, there's only maybe two or three clubs with a majority Scottish side.
But I also do see why he's gone for a mostly Scottish side. Had he tried to draft in players from England or elsewhere, he'd be paying more, as the players would want more to make it worth their while.
Though it's unfortunate at the lack of new foreign players to the club, and introducing them to a new world of football, it's still a worthy compromise to keep wages low.