I think its important to note the seperation that exists in triathlon. You have olympic distance athletes who race for the Olympic dream. These athletes are in a seperate catagory than the other catagory I will call "Ironman". I call it this because anyone in the sport that knows anything about tri knows that the sponsors and the fans follow what happens in Kona each year and not what happens in the World Championship Tri Series as a whole. Anyone that would disagree to that should try and find a bike brand count for the Beijing World Series final from 2011. Kona is the superbowl. People get tattoos of the M-Dot. Kind of a big deal. Not that the olympics are not a cool tat but its only a very, very, very, very select few people who can get that tattoo in Tri (9 males in the past 11 years can do that).
Noting that difference I think Lukas is in a unique situation where he actually could make some decent money persuing the olympic distance stuff and the Olympic dream. Lest we forget a medal in any sport is pretty spectacular, money aside. Another factor is that to be successful in Ironman you need to have a long build up to that distance and Lukas is a long ways from that (10+years). That being said Lukas will do fine but the real money is in Ironman racing. Example, Matt Reed. Kiwi born moved to US to get Olympic Tattoo. Once accomplished switched to half and full distance Ironman to make some money. Lukas will do fine because he stands a decent chance at both making money and getting the tattoo. Kind of cool.
But back to Wejo's question on money. Just like running its really only the top 10% of the professional athletes in triathlon that can "make a living" much less a comfortable one. The reference above to 300K is probably to one of the top 10%. Possible....yes. Likely....no. Ironman that percentage is a bit larger than the top of the olympic class.
I will also mention one other thing maybe worth considering before we throw Lukas into tha fire about leaving one of the most legendary cross programs in history. That is, who didn't change their mind a few times back and forth their first two years out of your parents house (AKA college for some of us)? I know I did. Yeah he waffled and is kind of back and forth right now, but lets make sure we remember he just finished high school last summer. Maybe some slack in his decision making process is in order. One other note...he left Oregon to join the program his father coaches. A lot better than jumping ship to Wisconsin or some other powerhouse. Being with family is big and something our country may be needing more of.