lets say i have created a new cryptocurrency with full pos mining, there are many people around the world download the wallet and runing it everyday and everything seems normall, but suddently no one running it again except my laptop and my desktop pc, my question is , is it possible that my cryptocurrency still run normally and though it is running by just two computer that always on???
Simple Answer = YES.
Detailed Answer,
As long as you have enough coins to keep the rated block speed of the coin , you can keep the chain running normally.
You will want to keep an equal distribution of those coins between the 2 computers, so they compete to stake which will keep your difficulty higher.
If your difficulty was too low like .00002 and someone else came online , they could overwrite your chain with theirs.
If you are designing your own coin and the total quantity of coins is low (less than a billion) ,
you want to have a very low minimum stake age like 1 hour and a longer blockspeed time of between 2 & 10 minutes.
Also if you want it to be used among the populace, you have to provide a Block Explorer and make sure it is on at least 1 exchange.
Also with only 2 PCs, you are very vulnerable to DDOS attacks from the internet.
The above is if you are trying to have a Public Blockchain.
If you only want a private chain not connected on the internet that no one else will use.
Then you don't have to worry about Exchanges, DDOS attacks, Public block explorers or history rewrite attacks.