If the rules are not changed, ideally the World Tour consists of max. 15 teams with the worst 2 teams demoting to PCT and the best PCT to WT each year to prevent Arkea like events.
The GC field can be filled with other PCTs with 7 wildcards. The WT one day races would have up to 10 wildcards. Enough space for the local teams and teams and other PCT's. With 20 PCT's their would be enough to pick from and I don't expect the GC's and other races to pick the same teams like now.
1. UAE
2. Visma
3. Soudal
4. Lidl
5. INEOS
6. Red Bull
7. Groupama
8. Decathlon
9. Bahrein
10. XDS-Astana
11. Movistar
12. Jayco
13. Tudor
14. Israel
15. EF Education First
Mostly international orientated teams and no "one country/trick/man only"-teams. Of course you can debate about above choices (but not picking favorites!). The year end ranking must decide.
A short verdict on the excluded (and thus PCT) teams:
- Alpecin: no climbers / GC riders
- Lotto: no climbers / GC riders except LvE
- Intermarche: team Girmay / no GC riders
- Picnic Post NL: very weak; depends on Onley and Poole
- Cofidis: weak big money "team"
- Arkea: will fold after 2025, no climbers/GC riders/classic riders
- UNO X: nice local PCT
- Total: typically PCT
- Q36.5: one man show
Oh wait... this was the system before the WT and then the UCI wanted to earn some money...

. Hopefully the OneCycling initative will not make it a Formula1 happening.