As more tokens keep coming into the market, it is assumed that more cyptocurrency exchanges will raise. this, we all know have a risk effect which is that hackers are empowered to try their luck especially on vulnerable ones.
I think you are misreading that correlation. An increasing number of tokens and an increasing number of exchanges are both just symptoms of the hype around crypto. Token issuers are doing a cash grab because hyped investors want to throw their money at anything they can. Exchanges see the hype and want to capitalize on it via trading commissions. Some of them are probably planning a long term exit scam too, disappearing with customer deposits, because it's the easiest method they see to amassing crypto wealth.
Hackers will continue to gain interest in stealing cryptocurrencies because of the irreversible payments and abundance of easy targets. Lots of vulnerable exchanges out there.