Extra games shouldn't really be an issue.
It's unlikely that a team at the bottom of the premiership is in Europe or made the latter stages of the cup competitions, so they won't be playing as many games as the top teams.
What gets me about all this is why people think that ring fencing will help domestic player development.
I understand the concern at the moment, with relegation looming, that teams are supposedly too scared to field their youngsters so bring in overseas journeymen with more experience.
However, I really don't think scrapping relegation will make a significant difference
Clubs in the hunt for top 4 will still play their strongest team because they want a play off spot.
Other teams will be pushing to make top 6 so they can get top level European qualification.
The next bracket of clubs will be looking at the euro challenge cup
Best case scenario is 2 clubs adrift at the bottom of the league feel safe so might bring some academy players through for 3 or 4 games at the end of the season
However those academy players are likely to be the best of their crop so would likely have gotten an opportunity anyway
I really don't see it making any major difference to young player development. There's just too much to play for throughout the league