It will take a long, long, long time to gain $100K in equity. Let's assume that homes may appreciate about 3% each year. It could take you 20+ years to attain $100K equity.
The answers to your other questions are impossible to answer. Nobody can predict the future value of real estate. But after the market returns to any sense of normalcy, I think it will be safe to say that real estate may appreciate about 3% each year, assuming the property is properly maintained & updated.
Buyer's Agent REALTOR