If I invest $10,000 in ETH and hodl for 1 year...will I be rich? Just curious

Yes, if you have the guts to risk that huge amount of money. If you invest you must accept anything that will happen. 10,000 is a lot of money and if youre too lucky on eth that you pick to invest it might x100 your investment.
There's a near 0 percent chance that ETH is going to go 100x in value in the next year. I'd be surprised if it goes 5-10x.
Depending on what the definition of rich is is your answer. I would expect you'd get a return between 20-50k.