Okay, I'll put my two cents on this issue. Please excuse any typos because I'm typing this on mobile.
As part of the Redemption League staff, to be honest, I was actually not too happy with how this new league suddenly appeared out of the blue. It's not because I was fearing how we were facing competition, but it was solely due to the fact that this seemed to be announced without any sort of preparation at all. We spent a good amount of time (aka 8 months or so) preparing all the necessary requirements so that we could launch successfully - including rules, sprites, badge design, characterisation, leader selection etc. It was when everything was finalized that we announced the presence of our League. Sure, we did face some problems along the way - but things went relatively smoothly because we were well-prepared.
The thing that bothers me the most about this new league is that I don't see any effort to distinguish this League from ours. Sure, system-wise, it can be difficult to come up with a new method to challenge, but I feel like the system is exactly like how we run our league. Some can argue that our system is similar to Reborn's, but if I recall correctly, there are some differences and we made sure we weren't copying the Reborn League entirely.
Tl;dr I'm happy to support the new league as long as it is not a complete replica of ours. You'll need new trainer card formats, new badge designs, new recruits etc. Organizing the league is very difficult and time-consuming - and I assure you, it will be very tough to manage this with only a few people. I wish you luck.