As it seems that you do not have the guts to leave the company you will need to try to change it from the inside.

This is what I did:

Find 2-3 people like you in the company. Make sure they are all respected people within their teams. Implement a prototype. Select the most ambitious manager you can find and show him the prototype.

This is not about technology: This is about power. Explain him that he can save tons of money, that he can reduce the number of outsourced people, reduce the operational costs, stop some providers (i.e. big database vendor) from ripping money off from the company and that you think that he is the only one with the guts to stop all this mess.

I was in this same situation 9 years ago. I made my guerrila war. Lost it. Quit the job.

I did not have the guts either, but this whole process (9 months) made me a better person. Lots of stress and lots of work. Quitting the job was easy as pie.

Now I have my own IT company. This is no paradise, but I will not work again in a big multinational company.

Good luck.