I am just talking in terms of years the spurs had a realistic chance, btw.
If you see my analysis below, this year's champion, assuming it comes from one of the 3 top western teams, will have survived the toughest road to a championship as far back as I could find, and would easily be the toughest road for a Spurs team that managed a championship.
A well established proxy for a team's strength is average margin of victory. Using AMOV for likely teams the Spurs would have to play in the west semis, western conference finals, and finals, and comparing that average strength of opponents to other years, we can get a relative sense of how tough this road will be compared to previous years.
AMOV total of final 3 opponents:
as of today for 2016:
okc, gsw, cleveland: 25.98!!
1999: Portland,Lakers, Knicks: 10.27
2003: lakers, mavs, nets: 15.33
2005: seattle, phx, det: 13.28
2007: phx, utah, cleveland: 13.55
2014: port, okc, miami: 15.09
In the last 20 years, the closest I came to this year was the Bulls 1997, which came to 19.72.
Bottom line, this team is arguably performing the best of any tim duncan-led team, but will be facing the toughest opponents of any spurs team to date, assuming no upsets of the top 4 teams, if we get to the finals.