Unlocking a summoner spell now costs a skill-point and maximum level has been increased to 20.
- Udyr could in theory opt-out of taking summoner spells to get all his skills to rank 5.
- You could go further and increase the maximum level to 22, and then have it so the bonus effects from masteries such as Summoner's Insight (Deprecated template: use Mi1 to Mi6.) have to be purchased in-game - i.e. rank-1 Flash and rank-2 Flash.
- Experience gain or level curve would be altered so that you reach level 19-20 at the same time as you would currently reach level 18.
Alternatively, leave max-level at 18 and introduce "summoner points" that you gain at levels 1, 6, 11 and 16. Summoner points are functionally identical but independent to skill points - i.e. at level 1 you have 1 Summoner Point and 1 Skill Point. This allows junglers to take Smite at level 1, etc, and all champions can have both spells at level 6 (or opt to take rank-2 spell, instead).
I'm not saying things need to change or even that this idea isn't full of holes. There's obviously the issue with Smite on junglers; the power of junglers with access to an extra spell; etc. What if...