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Say you have multiple devices/sensors connected to the Arduino through I2C. Wouldn't at some point the devices won't get enough voltage if you add too much? And how would you resolve that?

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Do you understand what voltage is?

Hint:  Voltage, Power, and Current are all different things.

Capacitor Expert By Day, Enginerd by night.  ||  Personal Blog:  || Electronics Tutorials for Beginners:  www.addohms.c

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If you bought breakout boards with sensors, those boards have many times pull-up resistors.
You don't want too many pull-up resistors.
If that happens, use 4k7 pull-up resistors and remove the pull-up resistors from the breakout boards.

About twenty I2C devices on the bus is no problem. In theory it can be many more. Too many long wires could be a problem.

All sensors should be powered, for example with 5V or 3.3V, independent of the I2C bus.

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