"It's not a must do. It would be a nice do, but it's not a 'must do'," said Walker. "When you look at the speed increases, the improvements in the car, you can realistically expect that we will possibly break that record unless we make major changes to backtrack, we're probably going to crack the record."
However, speed has its price, as Walker went on to explain, with every mile per hour increase adding four times the amount of lift.
"If we're going to ramp up the speed, as we make these changes, as the teams get more familiar with the car, as the engine manufacturers continue to invest money into the series, we're going to have to go quicker," Walker said. "Here is where we really started to look at it very carefully and say, what do we need to do. What we need to do and are going to do is we needed to look to, first, safety."
Already scheduled for the series is a new engine upgrade and homologation process for 2014, which in turn will require downforce adjustments to the car in order to enhance racing, overtaking, and safety. That will be followed by aero kits in 2015, with further tyre, aero and engine upgrades pencilled in for 2016/7.
Speaking in Detroit on Sunday, Walker put the expected life of the current DW12 chassis - which made its race début last year at the March season opener in St Petersburg, Florida - as seven years in total, with the series looking at a possible comprehensive body chassis and engine specification overhaul likely to be introduced for 2019
"2018 you're probably looking at the end of era of this current car," said Walker. "We're saying it probably is, or is rather, not probably. If you look at the current platform of the pieces we've got, even with the aero kits thrown in there, the basic package has been on the shelf for quite a long time at that point.
"There will be a lot of other ideas coming along, safety ideas, all kinds of things that come along, that will say that we need do some bigger changes," he added. "Then we're really faced with a situation, if we were so lucky, going into 2019 by saying, do we go with another new car, get the latest technology, or do we find another way?"
But Walker admitted that the current economic climate for motor racing might require the series to be more pragmatic in practice and for the new car to be a variant on the DW12 rather than a complete new development, although Walker admitted that he would love to have more competition from different chassis suppliers rather than relying on the current exclusive arrangement with Dallara.
"Because of the economic environment we're in, we're probably going to extend the life of that car another three or so years," he said. "How we're going to do that is take the basic spine, chassis, gearbox, other key components of the chassis, the rolling chassis, and say let's not do a kit, let's do a complete facelift, a complete body styling" which would allow for increased safety without rendering all the existing equipment obsolete as happened between the 2011 and 2012 seasons.
"For the time being, we're looking at a lean, mean economy out there, so we're going to keep some longevity in our path," Walker insisted. "It would give you a different look, a different performance. It should be about the car of the future. It should be a car - probably heard that word before - but a car that looks like a modern racing car.
"When you look at it, you will say: 'That's an IndyCar!'"