On the upside? Nintendo has a finite number of e-fuses to burn. Find enough exploits, and any further FWs would have the same number burned."Start".
Nintendo has been mitigating at every turn, often times very thoroughly. Notice how 4.x is already limited, 5.x is only going to get worse.
For the nth time: Nintendo's software has been rock solid almost at every turn, we've been exploiting nVidia's backdoors and memes... but Nintendo is fixing those too.
The Switch's code is regularly seeing internal audits and testing, they are on top of this and they're locking it down with increasing firmware.
Assuming you could get them to make enough new FW revisions, that is.