The block size needs increasing substantially over the next few years to be suitable for increased transactions. How will we achieve that is open to debate. It also depends on the state of the art computer technology.
We do need to increase the block size if bitcoin is to be used widely and as money remittance tool. 1MB will not be enough later next year. How many people support BIP100?
maybe the largest online currency and maybe the sixth largest reserve currency by 2030
maybe...
If bitcoin is still there in 2030, it will be the largest or the second largest currency. Apart from US dollar, other currency has too few users worldwide.