I wouldn't be surprised if we saw LFP replace most usages of lead acid batteries in the near future since the cell voltage is 3.2V nominal, and you can stack 4 cells to get a 12.8V battery, which would be a drop-in replacement for most lead acid applications.
This isn't true for multiple reasons. First and most importantly, full charge on a 4-cell LFP is 3.6 volts. That means full charge on a nominal 12V LFP is 14.4V. Charging voltage is therefore 14.6V or 14.8V and the details are handled by the BMS. Maximum charging current is also far higher than a six-cell flooded battery, which is fully charged at 12.6V, and where maximum safe charging voltage is about 2V over the current battery voltage. (Yes, some chargers do significantly more voltage — this is bad when done without per-cell temperature sensing which nobody does.) A flooded battery limits current, and charging systems take this into account. Dropping in a LFP might be fine, or it might cause the smoke to come out, and you have to understand the system to know which. Most alternators will burn themselves up, or at best, burn out the fusible link. On some vehicles that's easily replaced, but on most it's a harness repair. You cannot even reasonably charge lithium batteries with all solar controllers designed for flooded cells. Some of them are cheaply made enough that they will again burn themselves up, even cheaper MPPT units though it's mostly just PWM models.
Lithium batteries are great, but you cannot just drop them in to many applications. In others they will work OK, though most "intelligent" battery chargers not designed for them will only charge them to 80%, or will charge to 100% but charging slows to a trickle around 80%, because the charging voltage is incorrect.