If I have understood everything correctly. First of all no more xch can be created ever after the 45 day viacoin exchange period. Yet everytime you do something within clearinghouse like for example create an asset or contract to do so requires the destruction/burn of one or more xch. This would eventually mean that the world would run out of xch, so then what?
Satoshi called destruction of bitcoins a donation to everyone else. XCH running out completely seems highly unlikely.
I am somewhat worried by another thing. If very many VIAs are sold this way and there is no limit, a large portion of VIA supply will be in control of one man (Drak), this is dangerous. Large concentration of ownership will undermine confidence in VIA on the market. VIA will be ridiculed by rival coins with (pretended) fair distribution and so on.
You could also say the same about the amount of funds stored at exchanges. If this became a problem I would certainly take steps to minimize any concern but I doubt this will be a problem. FYI Otoh controls 1.5MM viacoins and it's not been a cause of concern.