IMHO, the reason The SNP got into so many seats was not necessarily a reflection of their pro-independence stance but a variety of other factors e.g.
(1) Lib Dems feeling they had been sold out by the coalition
(2) Failure of Labour Party to form a cohesive strategy and thus an effective alternative
(3) Annoyance at what voters saw as a U-turn by Cameron in giving (or not) more devolved powers to Scotland
(4) Increasing loss of a foothold by Scottish Tories
Therefore, IMHO, the return of so many seats to The SNP does not necessarily imply the majority now want independence. One must also bear in mind that, whilst the turnout was high, it was still almost 30% of the population under.
Of course, the reduction of the voting age by next year thereby encompassing 16 and 17 year olds may alter any subsequent referendum.