The jungle timer changes aren't bad in themselves. There's another, much larger, issue at hand.
The blue/red timers and spawn markers only widen the gap between solo and premade players. That's the most negative impact this change will have, from what I can see.
Premades will easily capitalize on spawn times, both aggressively and defensively. Solos will get abused by this change, especially due to the coming mid-lane reliance on blue.
You're only ostracizing solo players even further with this change, Riot. I hope you realize that.