its not a problem of hard drive space. Its a problem of limited bandwith for miners. Miners are only capable of receiving so many transactions in a 10 minute period. if the total demand for transactions exceeds the bandwidth of your average miner than people will be forced into other chains.
Where do you get the idea that tx bandwidth is a major limitation? Most miners use pools, certain those bandwidth limited do.
100 tps (roughly 2x PayPal) * 400 bytes (average tx size) = 40 KBps. Yeah not GB/s or TB/s but KB/s. Now a miner will need to receive tx and send out the block and send to multiple peers but with the raw tx flow being 40 Kbps even a 10 Mbps connection provides sufficient headroom. Bandwidth for tx was never a critical resource. ByteCoin solves absolutely nothing. Under your scenario ByteCoin would work in conjunction with another chain so any full node is likely going to need to be a full node on both chains meaning bandwidth requirements equal the sum of tx flows on both chains.
look guy, if bitcoin supplants the usd as the world reserve currency 10mb will not even be close to enough bandwidth to support that number of transactions without pushing fees into the triple digits. We are not speculating on bytecoin for the present we are speculating on the potential for its necessity in some distant future where crytocurrency is used for the majority of all trades in the world.