I'd say it's still worth signing up for for now, but only because it's reasonably priced. I think it's £29.99 for the season. Which, given the price to subscribe for one off matches from clubs (EFL Trophy games) / summer youth tournaments can be about £5-10 per game, means you still get plenty of games for your money.
The annoying thing is the price hasn't reduced, it's actually gone up over time (as everything does!) but the amount of U18 and U21 games you get to see is decreasing. And at a rapid rate of late, probably due to all the job cutbacks - and maybe changes in priority as well, with the covering of the women's team another factor in the U18's, and U21's especially, being pushed down the pecking order.