Shortly said.
Yes, crypto mining in general, is profitable and will remain profitable.
However, I wouldn't suggest you to invest that much money into something that you know nothing about.
I can say from experience that there will be problems, errors, you name it from time to time. Unless you can hire knowledgeable people who you trust to monitor your mining 'rig' 24/7, it won't be fun to watch and think why half of your GPUs aren't starting.
Also, even the 'starting phase' is a thing of its own.
You need to know the right memories to look for in GPUs. You need some advanced knowledge in the physics of electricity and power supply-ing just so you don't risk blowing your whole warehouse up in the air.
Overclocking the memories to a point where the cards can still function steadily can be a bit tedious if you're starting out.
I will also guarantee that you will need a steady supply of high-quality riser cards.
Just to name a few.
If you decide to hop in crypto mining, I would highly advise you to start very small. Try to do everything by yourself, and you'll learn the basics.