Open source is going to be used to co-opt people into service contracts. For example one product I use right now. If you use it in a very particular way you do not have to pay much if at all to use it. But if you get out of that lane you need to goto the 'service contract' route. I am not talking 10 dollars a month either. I am talking 1-3k per machine. These things almost all want clusters. So usually at least 3. If you are using that level you probably will want at least 2 areas (dev, prod), more if you are doing it 'right'. So now your 'free' stuff just went sideways and now costs 200k+ just to get the software, per year. Oh but just use AWS/Azure/Google you say, add even more to that cost as they bury it in their usage fees. Then on top of that you need to develop your own programs.

I predict the open source bits will be bait. With many 90% solutions. The proprietary bits will be the ones you need to make it work like a real program. Oh there will still be soup to nuts full on free stacks. But I seeing more and more of this service fee way.

As for making hiring easier? Not so much. When you can get 100+ applicants for 1 position. The reality is at least 99 of those have to go away. One more filter does not do much other than let you round bin things faster say 'cant find anyone' then grab your favorite contracting firm and hire them anyway.