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Dominance in context of what? Price? Adaptability? Technological dominance?

Bitcoin has been the first cryptocurrency, it has more trust in general amongst the masses, it is deflationary in nature(other AltCoins can also have this property).

Cryptocurrency in general are not backed by any physical asset, say petrol price depends on the demand supply, similar for gold etc. But the price of cryptocurrency currently depends on the adaption amongst the masses, till it actually starts providing tech bases solutions (decentralised system) and it starts getting adapted.

Coming back to the original point, Will AltCoins Dominate? No they won't, reason, they will always have less adaptability then Bitcoin. Yes Eth has a strong developer community support and it is focusing more on developing the decentralised ecosystems.

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