RBBC
There is no proof that RBBC is on the rise. I created an excel spreadsheet charting the last 30 years (yes, that's 30 years) of RB production. A team's RB1 is the only RB to have increased his workload continually over the years. Here are some percentages:
1978
RB1 - 38.77% of the carries, 40.09% of the catches, 35.95% of the TD's
RB2 - 25.8% of the carries, 22.03% of the catches, 30.18% of the TD's
RB3 - 13.85% of the carries, 17.62% of the catches, 13.24% of the TD's
RB4 - 8.45% of the carries, 3.96% of the catches, 11.54% of the TD's
RB5 - 3.66% of the carries, 4.19% of the catches, 6.21% of the TD's
1988
RB1 - 44.29% of the carries, 44.34% of the catches, 36.85% of the TD's (increased in all 3 areas from 1978)
RB2 - 23.34% of the carries, 23.82% of the catches, 24.42% of the TD's (increased in 1 area from 1978)
RB3 - 13.01% of the carries, 9.91% of the catches, 17.77% of the TD's (increased in 1 area from 1978)
RB4 - 5.34% of the carries, 3.54% of the catches, 13.8% of the TD's (increased in 1 area from 1978)
RB5 - 2.13% of the carries, 1.89% of the catches, 4.72% of the TD's (decreased in all areas from 1978)
1998
RB1 - 57.46% of the carries, 49.87% of the catches, 37.76% of the TD's (increased in all 3 areas from 1988)
RB2 - 18.01% of the carries, 21.9% of the catches, 16.1% of the TD's (decreased in all areas from 1988)
RB3 - 7.22% of the carries, 6.6% of the catches, 21.53% of the TD's (increased in 1 area from 1988)
RB4 - 3.99% of the carries, 4.75% of the catches, 16.9% of the TD's (increased in 2 areas from 1988)
RB5 - 1.33% of the carries, 2.64% of the catches, 6.41% of the TD's (increased in 2 areas from 1988)
2006 (haven't completed 2007 yet, so had to use 2006)
RB1 - 58.62% of the carries, 54.95% of the catches, 44.23% of the TD's (increased in all 3 areas from 1998)
RB2 - 21.37% of the carries, 26.89% of the catches, 24.06% of the TD's (increased in all 3 areas from 1998)
RB3 - 5.63% of the carries, 4.95% of the catches, 15.42% of the TD's (decreased in all areas from 1998)
RB4 - 1.96% of the carries, 1.18% of the catches, 9.87% of the TD's (decreased in all areas from 1998)
RB5 - .47% of the carries, 0% of the catches, 4.52% of the TD's (decreased in all areas from 1998)
RBBC is not on the rise. The trend points toward RB's 4 and 5 being phased out, and RB3 losing touches to both RB1 and RB2. Just because RB2 has increased touches, that doesn't mean he is taking them away from RB1.