It is proven and tested that Bitcoin is a good investment in the long-term and that cannot be denied, and Bitcoin has many features that other cryptocurrencies do not have, even if it is used as a payment option online it is a big deal how much more even with the opportunity it gives to people. In addition to this it also provides savings in the future, so the scalability that you are talking about is only a low percentage of the problem that a bitcoin holders will face honestly in my opinion.
I agree with your options and opinions, and have been trading since last year. But in the coming times when the internet advancements and the technology advancement and many other web related projects come into the market, some factors must affect on to the values of BTC like, its Scalability, Volatility and market maturity, Security and hacking risks etc and will face several challenges that may impact its future while Bitcoin has gained significant popularity and recognition. In view of the comparative assessment of the market and the prevailing conditions, BTC will face some challenges till now, and I will not hesitate to say here that there is already a very good and secure system is in Place.
We havent seen any exploit or security issues in Bitcoin but somewhat most competitors would really be point out out about its scability issue which most projects are trying out to patch up and resolved that kind of problem, but it did really make out such changes or kicking out Bitcoin into its place? None of them did succeed on which it did really still able to sit on the top of the markets despite of those flaws and this does really prove out that community support would be always the biggest consideration about on projects success. Also if we do speak about that irreversible transaction is already that something revolutionary and this is why
its not really that surprising that it is really that mainly been loved by those people who are engaging into crypto. Challenges is there but doesnt mean that it would really be over for Bitcoin
to fly with colors even into the future.