For most traders it will just mean that they will have to replenish their accounts with more frequency than before
Think of your, or any system.... there are so many scenarios that crop up... its virtually impossible for a mere retail trader to be able to code them, in terms of knowledge, etc.
Also, true algo trading requires co loaction of server, which needs roughly 3 to 5 lakhs a year ( thats AFTER ) considering the lowered rates of the NSE.
Add to that a few thousand per month for software access, and you have just pushed out 99.9999 % of retail traders out of the reckoning.
Algo trading without co location is like donating money to other traders. That moeny is better used on holidays...