Who said bitcoin is on its maximum development? It's still being developing all time and there are a lot of space to grow for developing.
Can we still expect better coin than Bitcoin?
If we think about different features of bitcoin with some other existing coin, they are better. You can get a better coin but you can not get
the most decentralized coin.
Most of the cryptos are decentralized if I'm not wrong because of the concept of blockchain technology. Bitcoin still is on the process of development despite of its market value at this moment and the community that it have established. Once adaptation became widely implemented, things could go better not only for Bitcoin but also to this industry.There are lot of developments that could make Bitcoin a better crypto, and in general aspect.