Nop, somehow bitcoin generates good profit margin to investors, Without btc, alt-coins will never evolve in digital world, Bitcoins has also advantages in real world, It is very efficient to use and a good source of income:)
Currently it is not at all efficient to use so you can not say that. Long tx times coupled with large tx fees do not allow it to be used as a daily transaction currency. I am a big proponent of bitcoin and believe these fixes will be enabled but until they are, you should not expect Bitcoin to be used for easy transactions on a widely adopted scale.
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It's made large improvements recently. This has been my biggest complaint for the last several months, how useless and expensive it was for transactions, but the mempool has been cleared out and transactions are cheap again. I don't know if this is entirely due to SegWit or if a massive ongoing spam attack has ended, or both. But the most important thing is that transactions can be completed at a fraction of the cost of a few months ago. Whether that's as good as it was or is a long-lasting change, that remains to be determined.