Actually, $6.50/month is the ATA rental, which is required, not the modem rental, which is also required for an additional $9.50/month on top of that $6.50/month. The IPv4 address on FTTN does not change for as long as the circuit is provisioned. If you really want POTS, they can add it for another $10+tax/month after a one-time $150 setup fee.
So, if I add a recurring $15/mo (+tax) to the cost I now pay for Fusion DSL/ phone POTS service, I can replace my current service, and essentially get FTTN Internet / VOIP phone service with a DHCP assigned IPV4 address that doesn't typically change, though it's not 'fixed' (no assurances).
Though a future Gigabit Fiber service may eventually be offered for the same monthly cost as Fusion DSL (plus Fiber modem rental), there is currently no way to keep my current Sonic Fusion service with the current low out of pocket cost, and still rise above a 3 Mbps download speed through services now offered by Sonic in my area. And as yet, there is no indication of a date when or if Fremont, CA will be added to Sonic's Gigabit fiber network, so I can expect the above FTTN's added rental and fee costs would remain elevated by about $15/mo + tax for the foreseeable future, if choosing this option. PLUS, under FTTN, I'd either have the loss of, or re-investment cost of a POTS line (which I feel I wouldn't need with Gigabit fiber and a fixed IP).
Net neutrality is very important, and I applaud Dane and Sonic for efforts made. But with my current Internet, I'm nearly 'neutralized' already, being choked with slow speeds, and with my only options with Sonic being increased out of pocket cost to me.