Among the many changes, the new rules would require batteries in consumer devices like smartphones to be easily removable and replaceable. That's far from the case today...
The only weakness with the S5 was the charging port having a cover that could easily break off, but modern ports these days are waterproofed, so they could just make one of those.
Personally, if they remade the S5, with a modern board and charging port (rather than the Micro-USB 3.0 monstrosity), I'd be very tempted to buy it. The IR blaster and everything else was just nice to have.