I think this DUP thing is getting overhyped now.
They'll do nothing of any significance and it's not like there's really much choice. The Tories have been rejected by 4 of the 5 parties that could help them. Theresa May is a Tory prime minister, she's not going to shaft herself again and have a true minority government because of some kind of noble stand. They want to be in power.
She'll do far worse things than throw the DUP a few bones in the next 5 years, I'm sure of that.