How will Riot prevent Dominion's meta from being tanky DPS focused?

Ways that Dominion seems similar to Treeline:

Potentially shorter games
Greater emphasis on mobility and ganks
Smaller teamfights (from trying to control several points at once)
Even more jungle space


Ways that Dominion seems different from Treeline:

Larger map and longer travel times between points? Though I don't know the map size yet.
Slightly different item list
Easier for a squishy to split-capture on Dominion than to split-push on Treeline?
Nothing stops minions but players and other minions


You can reassure me by explaining the points on the "different" list to show how balanced team compositions will be better than an entire team of 1v1ers.

Much fewer armor and magic resist items. Significantly less, even.

how is it gonna be similar to treeline in meta since u've gotta defend ur capture point over pushing and destroying turrets don't u? meaning rather then tanky dps it'll be champs who can shelter and keep a location like say heimer and teemo's shroom army that'll come out best.

The reason TT is tanky focused is because it's 3v3.
This mean less total damage than 5v5. This is the reason tanky teams flourish, because they can't be killed. Also, there are too many walls and champions like poppy, xin, jax, trynda and renekton have great advantage. From what I've seen SC has a lot more open space, despite it's size, and it's 5v5, which means raw damage is gonna get valuable again vs tankyness. I believe the balance issues are gonna come from mobility abilities, not from a certain champion type.

The reason why TT is so focused on tanky character is because of the size of the map. Since the map is incredibly small team can afford to roam very early and tanky dps dominate the early game. I cant see a gamemode how's objective is to control MULTIPLE point to allow any kind of roaming. If anything, expect character with really good poke or great sustain to be very strong (Ez, Soraka, Mundo, Caitlyn...)

The meta will be the same in that sooner or later only a fraction of the champion pool will be a viable pick on that map.