Much less than that tbh. What you need is knowledge on network systems, database architecture, and a fine template called the MMO Starter Kit (it’s in the marketplace forums). You also need to get yourself a server or 2, and know about virtualization.
If you were to purchase all of those assets, or 3dsMax plugins to create said assets, you’re looking at right around $2500 or so (CityEngine is the most expensive at $500). But that does not include the cost of the different programs. For example, you will want to get Autodesk Creation Suite, which is about $2,000, the character can come from Mixamo, BonesPro, WorldMachine.
Time? Well, it depends on prior knowledge. It shouldn’t take long to get a sample prototype out if you use OTS stuff.
How are plugins supposed to make all of your assets? You can’t buy all of the assets you’d need, unless you don’t care what the game looks like. If you have a team of 20 low-paid workers for a year that’s at least $1 million.