No. The network's ability to generate value from tx fees is fixed (-ish, constant with regard to the size/value/use of the network.) The total cost of all minting nodes is a linear function on the number of nodes. Ergo, above a certain number of minting nodes, the cost of running all those nodes exceeds the network's ability to generate value from tx fees. This will lead to ad hoc centralization as people merge their stake -- reducing the number of nodes -- below the cut-off for the network being profitable as a whole.
Having more nodes doesn't make running any individual node more expensive, it just spreads the rewards of running such a node more thinly.