If, Blocknet project starts, are there any other coins which have said they want to be part of it ?
Yes, lots have. I get a lot of PMs. :-)
Once the Foundation's Board is in place, we'll establish procedures for ratifying coins. We'll also publish a schedule of regular meetings, at which coins can propose to develop Blocknet-relevant technology and apply for funding.
At this stage, we'll be in a position to consider adding new coins to the Blocknet. May there be many!
If more coins join blocknet it means block holder will benefit more fee plus blocknet value will go up as well as the coins that in the blocknet value should go up to
Thanks
The value of anything depends on the perception of all people participating in the market for the asset.
Since people's valuation and opinion about something is not based on any rational algorithm and can change drastically in an instant (as you see often on this forum) there is no possible way to tell what will be the value of anything in the future.
There is absolutelly no correlation between the number of participating coins in the blocknet and the value of blocknet. However more coins can positively affect the perception of blocknet thus make people to value it more.
About the fees: Yeah, if more coins are participating, then the chances of more transactions are greater. Meaning more fees.