And decreasing sales is exactly what the EU wants to accomplish. To stop people buying a whole new phone every couple of years.
Unfortunately I do expect other tricks towards planned obsolescence. Long-term support is now a thing but what they can still do is make phones slower over time. Even Apple did this with the iPhone 6.
If the phones with replaceable batteries break more often (and they most likely will), then people will buy them more often, not less.
Also, a new battery is how much - €100 for an iPhone battery? It's not that expensive.