With brands becoming more comfortable with forging direct bonds with tech startups, some SXSW attendees were questioning digital agencies' continuing role in connecting the two, writes John McDermott. "The general sentiment among tech entrepreneurs at SXSW was that we're experiencing 'the beginning of the end' for digital agencies," McDermott writes. R/GA's Kyle Bunch says digital agencies need to "work with startups to make the pie bigger rather than fight over the same slice."