Take my advice with a grain of salt. My crystal ball is just as foggy as anyone else's. We're in an environment now where for five years everyone has been screaming about how hyper inflation is coming.
The Fed did everything it could to create Inflation, yet it wasn't able to. The Fed gave the money to the banks, but the banks couldn't loan it. The Fed even bought mortgage backed securities to try to prop up the market. Now it is trying to lower lending standards again.
The bottom line is, no matter what the government tries, there simply is not enough demand for debt by people with credit. Some are scared by the Great Recession, some are already drowning in government student loan debt, some are simply too old to want to move. If something is coming that will reverse those trends, I haven't seen it yet.
This tells me that deflation is probably more likely in the future than inflation. I believe that the trend of low inflation/deflation and decreasing wages will continue. 5-10 years from now I see advances in automation that will increase deflation even more.
Most people on this site will tell you to shoot for at least $100 door in cashflow and the deal will work. Many will point to increased values over time and increased rents over time. Inflation both in increased values and rents certainly made many people rich in the 80's and 90's. I think you now need to consider decreased rents over time and decreased value over time in your calculations.