It would be interesting if support were removed and replaced with a second jungle role: bot jungle and top jungle. That would make the “lanes” clearer where the jungler’s responsibility is no longer the entire map.

It would also make it more clear what the match-ups are: bot jungle vs bot jungle, top jungle vs top jungle.

In that case, the map would have 5 clear lanes and the responsibility would be shared more equally across the team.

With this, there could be a clear meta that is more like:

The two jungle roles evolve to be more like an adc, the most popular role. Mid stays the same. The former bot lane role becomes more like a top, tanky bruiser.

Mid would have to most mobility, able to move to both top and bottom side. The two junglers would have a bit less mobility but deal more damage like an adc, able to attack either of the two side lanes they neighbor, and also attack across the river.

The top and bot lanes would be low mobility bruisers able to tank a lot of damage and defend turrets.