but on a longer run when difficulty becomes very high where mining completely becomes nonviable option in the neighborhood and only large and corporate organizations could only afford to do mining...
Mining is designed to be less profitable as possible (hint: half reward every 4 years)
This prevents corporate pour money into mining business. As you can see now, there no ASIC hardware on the market is profitable. If you think you will make profit, when bitcoin price is up. Then it's better to buy bitcoin.